If you've ever wanted to delete all the email on your iPhone in one fell swoop, you might have been frustrated that there's no "select all" button to let you trash everything at once.
Thankfully, even though there's no obvious way to do it, you can still delete all the email on your iPhone with a few taps.
There's one caveat: This process works a folder at a time. So while you can delete your entire Inbox at once, if you store email in a lot of subfolders, you may need to delete the contents of each folder one at a time.How to delete all of your emails from folders of your iPhone's Mail app
1. Open the Mail app.
2. Open the folder that you want to flush out - this can be your inbox, a folder within one of your email accounts, or even the "All Inboxes" view that combines all the inboxes on your phone.
3. Tap Edit at the top of the screen.
4. Tap the first item in the folder.
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Apple news